99 Clojure Problems – 61A: Collect the Leaves of a Binary Tree in a List

"61A (*) Collect the leaves of a binary tree in a list. A leaf is a node with no successors. Write a method leaves to collect them in a list."

(deftest p61a-leaves
  (is (= '(b d e) (leaves '[a [b nil nil] [c [d nil nil] [e nil nil]]]))))

A variation on the previous exercise. Solution.

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